Sulfites — HTS 2832
Sulfites; thiosulfates
Chapter 28 › Heading 2832
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 2832 is a broad product category for sulfites and thiosulfates—chemical compounds generally identified by their chemical composition and the sulfur-oxygen groups they contain. It can include different salts and related forms, so the heading alone is not usually enough to determine the complete tariff classification.
To reach the correct 8-digit HTSUS code, first confirm that the product belongs in heading 2832, then narrow it using the applicable subheading descriptions. The decisive details commonly include the exact chemical substance, the cation or other material combined with it, whether it is a particular sulfite or thiosulfate, and sometimes its physical form or preparation. Use the product’s chemical name, formula, composition, grade, and intended use as supporting evidence; classification may require customs-broker or other professional review.
What to check
- Obtain the safety data sheet, certificate of analysis, technical specification, and chemical formula before classifying the product.
- Identify the exact compound and distinguish a sulfite from a thiosulfate; do not classify from a trade name alone.
- Read every subheading and the relevant HTSUS notes, and compare the product’s material or chemical type with the wording at the 8-digit level.
- Check whether the product is a pure chemical, mixture, solution, or preparation, because that may affect classification outside or within this heading.
- Ask a customs broker or seek a binding ruling when the composition, form, or competing headings creates uncertainty.
HTS heading 2832 summary
Sulfites is a 4-digit product category containing 2 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Sub-categories
| Code | Description |
|---|---|
| 2832.30 | Thiosulfates |
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 2832.10.00.00 👉 | Sodium sulfites | 1.5% | Free | 4.5% |
| 2832.20.00.00 👉 | Other sulfites | 3.1% | Free | 25% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 2832?
Sulfites; thiosulfates. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.